My parents taught me about Christianity, but they are notorious liars and hypocrites, so I put it in the 'stupid' file and left it there.
As an adult, I saw how unhappy everyone was and how futile everything seemed. I looked around at all of the failed marriages and broken homes. I looked at the stacks of self-help books in everyone's houses and all of the prescriptions they were taking just to get through the day. I looked at my own life- my desperate pursuit of wealth and notoriety, total inability to connect with people emotionally and aversion to the uncertainty of stability.
I saw all of that and decided I wanted to try something different. I had to try something different because I was on a path that would inevitably lead to misery, a string of failed marriages and kids who resent me. Even if I did achieve my work goals, it would not 'fix' anything.
I made the decision to attempt living as a Christian. I needed a new lens through which to view the world that would help me make the right decisions and avoid the pitfalls of the world. Although many of the people described above were self-professing Christians, it was pretty clear that they were doing it wrong. I wanted to do it right. What the Bible says about how to live our lives, IF FOLLOWED, will result in good things. It's solid advice.
Eventually it worked. I, I, I, I.... I became a Christian, but now with hindsight I can see so clearly how it was not MY doing. God called and I answered, even though I didn't recognize it as God at the time. He changed my heart and my life.